Seasonal compensation implied no weakening of the land carbon sink in the Northern Hemisphere under the 2015/2016 El Niño  

作　　者：Fangzhong SHI Xiuchen WU Xiaoyan LI Philippe CIAIS Hongyan LIU Chao YUE Yuting YANG Shulei ZHANG Shushi PENG Yi YIN Benjamin POULTER Deliang CHEN 

机构地区：[1]State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China [2]Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [3]Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation,Qinghai Normal University,Xining 810016,China [4]Research and Development Center for Watershed Environmental Eco-Engineering,Beijing Normal University(Zhuhai),Zhuhai 519085,China [5]Laboratoire des Sciences du Climat et de l’Environnement(LSCE),CEA-CNRS-UVSQ,UMR821291191,Gif-sur-Yvette,France [6]College of Urban and Environmental Science,MOE Laboratory for Earth Surface Processes,Peking University,Beijing 100871,China [7]State Key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China [8]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),School of Atmospheric Sciences,Sun Yat-sen University,Guangzhou 510275,China [9]California Institute of Technology,Pasadena,CA 91125,USA [10]Biospheric Sciences Laboratory,NASA Goddard Space Flight Center,Greenbelt,Maryland 20771,USA [11]Regional Climate Group,Department of Earth Sciences,University of Gothenburg,Gothenburg SE-40530,Sweden

出　　处：《Science China Earth Sciences》2024年第1期281-294,共14页中国科学（地球科学英文版）

基　　金：This study was financially supported by the National Key Research and Development Program of China(Grant No.2022YFF0801802);the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(Grant No.2019QZKK0306);the National Natural Science Foundation of China(Grant No.42171050);the China Postdoctoral Science Foundation(Grant No.2023M730281);the State Key Laboratory of Earth Surface Processes and Resource Ecology of Beijing Normal University(Grant No.2023-KF-07).

摘　　要：The recurrent extreme El Niño events are commonly linked to reduced vegetation growth and the land carbon sink over many but discrete regions of the Northern Hemisphere(NH).However,we reported here a pervasive and continuous vegetation greening and no weakened land carbon sink in the maturation phase of the 2015/2016 El Niño event over the NH(mainly in the extra-tropics),based on multiple evidences from remote sensing observations,global ecosystem model simulations and atmospheric CO_(2)inversions.We discovered a significant compensation effect of the enhanced vegetation growth in spring on subsequent summer/autumn vegetation growth that sustained vegetation greening and led to a slight increase in the land carbon sink over the spring and summer of 2015(average increases of 23.34%and 0.63%in net ecosystem exchange from two independent datasets relative to a 5-years average before the El Niño event,respectively)and spring of 2016(6.82%),especially in the extra-tropics of the NH,where the water supply during the pre-growing-season(November of the previous year to March of the current year)had a positive anomaly.This seasonal compensation effect was much stronger than that in 1997 and 1998 and significantly alleviated the adverse impacts of the 2015/2016 El Niño event on vegetation growth during its maturation phase.The legacy effect of water supply during the pre-growing-season on subsequent vegetation growth lasted up to approximately six months.Our findings highlight the role of seasonal compensation effects on mediating the land carbon sink in response to episodic extreme El Niño events.

关 键 词：El Niño Seasonal compensation effect Vegetation greening Land carbon sink Net ecosystem exchange Legacy effect 

分 类 号：P732[天文地球—海洋科学] P467